Université de Fribourg

Inference of evolutionary jumps in large phylogenies using Lévy processes

Duchen, Pablo ; Leuenberger, Christoph ; Szilágyi, Sándor M. ; Harmon, Luke ; Eastman, Jonathan ; Schweizer, Manuel ; Wegmann, Daniel

In: Systematic Biology, 2017, p. -

Although it is now widely accepted that the rate of phenotypic evolution may not necessarily be constant across large phylogenies, the frequency and phylogenetic position of periods of rapid evolution remain unclear. In his highly influential view of evolution, G. G. Simpson supposed that such evolutionary jumps occur when organisms transition into so-called new adaptive zones, for instance...

Université de Fribourg

Sino-Himalayan mountains act as cradles of diversity and immigration centres in the diversification of parrotbills (Paradoxornithidae)

Liu, Yang ; Hu, Junhua ; Li, Shou-Hsien ; Duchen, Pablo ; Wegmann, Daniel ; Schweizer, Manuel

In: Journal of Biogeography, 2016, vol. 43, no. 8, p. 1488–1501

Aim: Montane regions like the Sino-Himalayas constitute global diversity hotspots. Various mechanisms such as in situ adaptive divergence, speciation following immigration or allopatric diversification in complex landscapes have been proposed to account for the exceptional diversity found in a particular clade in a montane setting. We investigated macroevolutionary patterns to test these...

Université de Fribourg

Parallel adaptations to nectarivory in parrots, key innovations and the diversification of the Loriinae

Schweizer, Manuel ; Güntert, Marcel ; Seehausen, Ole ; Leuenberger, Christoph ; Hertwig, Stefan T.

In: Ecology and Evolution, 2014, vol. 4, no. 14, p. 2867–2883

Specialization to nectarivory is associated with radiations within different bird groups, including parrots. One of them, the Australasian lories, were shown to be unexpectedly species rich. Their shift to nectarivory may have created an ecological opportunity promoting species proliferation. Several morphological specializations of the feeding tract to nectarivory have been described for...